Gauss-Jordan elimination on $$$\left[\begin{array}{ccc|c}1 & 0 & 0 & 9\\0 & 1 & 0 & 8\\0 & 0 & 1 & 7\end{array}\right]$$$
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Your Input
Perform the Gauss-Jordan elimination (reduce completely) on $$$\left[\begin{array}{ccc|c}1 & 0 & 0 & 9\\0 & 1 & 0 & 8\\0 & 0 & 1 & 7\end{array}\right]$$$.
Solution
The matrix is already reduced.
Answer
The reduced matrix is $$$\left[\begin{array}{ccc|c}1 & 0 & 0 & 9\\0 & 1 & 0 & 8\\0 & 0 & 1 & 7\end{array}\right]$$$A.